readReference error with node-mongodb-native

app.js

var mongodb = require( 'mongodb' ),
    Server = mongodb.Server,
    Db = mongodb.Db,
    MongoModule = {};

MongoModule.setup = function() {
    // Initialize the db connection
    var client = new Db( 'tartempion',
        new Server(
            '127.0.0.1',
            27017,
            {
                auto_reconnect: false,
                poolSize: 4
            }
        )
    );

    client.open( function( err, db ) {
        if ( err ) throw err;
        MongoModule.db = db;
        MongoModule.collection( 'pages', function( e, p ) {
            if ( e ) throw e;
            console.log( p );
        });
        console.log( 'Database driver loaded.' );
    });
};

MongoModule.collection = function() {
   this.db.collection.apply( this.db , arguments );
};

MongoModule.setup();